B&B Electronics DUALCON-3 - Datasheet - Manual (Page 14)

DUALCON-3 USERS GUIDE
The unit is now calibrated and ready for use.
Note: The unit will retain the new settings on power down.
When the unit is used to convert a thermocouple input it is important when
calibrating to ensure that the thermocouple simulator employed is switched to
automatic cold junction compensation and is at the same ambient temperature as
the DUALCON. Note that this is not always easy to achieve, especially if the
DUALCON is mounted in a warm cabinet. An altenative method is to use an ice-
point reference and a mV source.
6. INSTALLATION
The DUALCON’s input and output circuits are classed as Separated Extra Low
Voltage (SELV). This means that they must not be externally connected to
voltages exceeding 30V ac or 60V dc, nor do they generate voltages above these
limits internally. Where a higher voltage input is required a specially designed
DIVIDER unit can be used to condition the input signal prior to connection to the
process input terminals.
The DUALCON unit clips directly onto ‘Top Hat’ (TS35) symmetrical DIN rail.
Ideally, mounting orientation should be vertical, with the power supply situated on
the top face to minimise temperature rise. Good airflow around the unit will
maximise reliability of the instrument.
The use of bootlace ferrules is recommended on wiring terminations. Do not
exceed terminal torque rating of 0.4 Nm – use an appropriate screwdriver. The
unit can be removed from the DIN rail by sliding a small screwdriver into the slot
at the rear of the enclosure on the lower face and gently levering the metal clip,
whilst lifting the unit from the rail.
Although the unit is protected by a non-resettable internal fuse, it is essential that
the following provisions are made in the installation:
An anti-surge fuse with a voltage rating of 250V ac and a breaking capacity of 35A
at 250V ac shall be wired in series with the supply live conductor (terminal 2). For
230V supplies T63mA should be used and for 115V supplies T125mA should be
used. An appropriately marked or labelled switch or circuit breaker meeting the
requirements of IEC947-1 and IEC947-3 shall be included in the supply
installation in close proximity to the equipment, within easy reach of the operator.
The supply neutral (terminal 1) should be connected to the mains supply neutral.
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14 IIG-010901